pop does not provide a mechanism to push mail back to the server once deleted
Its not in the protocol specification. But its easy and minimal. The email client, is caching your inbox, and once you *delete* a message from the server, the cached copy is moved to the trash. Which is a folder on the client.
To move the message back, you would need to create a new message with the old message content. Which... if you need to .. then you may be able to edit the trashed email as new and resend it back to yourself.
But if you really need that type of functionality. You need to switch to IMAP.
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